Design and Characterization of Nanostructured Frequency - Selective Surfaces for Aerospace Applications
- Paper number
IAC-06-C2.8.02
- Author
Mr. Marco Regi, University of Rome "La Sapienza", Italy
- Coauthor
Prof. Mario Marchetti, University of Rome "La Sapienza", Italy
- Coauthor
Dr. Fabrizio Frezza, University of Rome "La Sapienza", Italy
- Coauthor
Dr. Luca Amantini, University of Rome "La Sapienza", Italy
- Coauthor
Dr. Simone Paulotto, University of Rome "La Sapienza", Italy
- Year
2006
- Abstract
The Frequency-Selective Surface (FSS) is an important application in many engineering sectors. In particular in the aerospace for radomes, filters and radar communications. The traditional FSS are constituted by two possible configurations: periodically-perforated metallic screens, or arrays of metallic patches printed on dielectric substrates. Aeronautics, military and naval applications are the typical technological fields involved in the FSS developments. The requirements of a FSS are: • Pass-band filter behaviour • To stealth the surface to the external observer. With a specific design of the traditional FSS, thanks to the Floquet theorem, it is possible to select a unique frequency value of the above filter. Solving Maxwell equations it is possible to determine the theoretical electromagnetic FSS behaviour. However, considering the complexity of the phenomena involved, only with an experimental test it is possible to perform a realistic characterization of the FSS. With the nanotechnology, new FSS kinds are introduced. In fact, using particular matrixes (thermo-plastic and thermo-setting polymeric resins, silicones, etc.) with nanoparticles (structured and not as per graphite, metals, etc.) homogeneously dispersed, it is possible to produce a material with electromagnetic structural and mechanical requested properties. On the other hand, traditional FSSs provide only the electromagnetic properties. For a nanostructured FSS a particular technological manufacturing process is requested, useful to obtain the following micro- and macro-properties: homogeneity, continuity and isotropic characterization (necessary to the imposed requirements). Particular attention is devoted to the use of carbon nanotubes which represents the nanostructures with the most interesting mechanical and electromagnetic properties. More test will be performed to analyze the abore characteristics of the carbon nanotubes. Moreover, these innovative FSSs provide a continuous monolithic structure with a significant improvement in the reliability of the systems in which they are integrated. The paper is organized as follows: 1. section I: introduction of the traditional and nanostructured frequency - selective surface (FSS). General discussion of the nanotechnologies applied to the electromagnetic systems 2. section II: description of the dedicated software developed 3. section III: sample manufacturing (for the FSS test using waveguides; massive nanostructured plate useful to study, with NDT test, the morphology of the composite material produced) 4. section IV: sample characterization (SEM statistic analysis of the particles used; EDX chemical analysis; mechanical test: static and dynamic; NDT test useful for the evaluation of isotropic, homogeneity and continuity properties) 5. Section V: electromagnetic test of the nanoFSS produced; result analysis and final consideration of the research activities performed.
- Abstract document
- Manuscript document
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